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Vulnerability record · CVE-2021-24147 · published 18 March 2021

CVE-2021-24147: Webnus modern events calendar lite cross-site scripting vulnerability

Webnus · Modern Events Calendar Lite

Unvalidated input and lack of output encoding in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not sanitise the mic_comment field (Notes on time) when adding/editing an event, allowing users with privilege as low as author to add events with a Cross-Site Scripting payload in them, which will be triggered in the frontend when viewing the event.

5.4 CVSS 3.1 Medium EPSS 0.75% · top 46.0% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Unvalidated input and lack of output encoding in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not sanitise the mic_comment field (Notes on time) when adding/editing an event, allowing users with privilege as low as author to add events with a Cross-Site Scripting payload in them, which will be triggered in the frontend when viewing the event.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://wpscan.com/vulnerability/0f9ba284-5d7e-4092-8344-c68316b0146f ExploitThird Party Advisory
https://wpscan.com/vulnerability/0f9ba284-5d7e-4092-8344-c68316b0146f ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-4458Webnus modern events calendar lite sql injection vulnerabilityThe Modern Events Calendar Lite plugin for WordPress is vulnerable to SQL Injection via the 'id' parameter of the 'wp_ajax_mec_load_single_page' AJAX…EPSS 0.40%9.8CVE-2021-24946Modern Events Calendar Lite unauthenticated SQL injectionThe Modern Events Calendar Lite WordPress plugin before 6.1.5 does not sanitise or escape the time parameter before using it in a SQL statement withi…EPSS 73%analysed9.6CVE-2024-6522Webnus modern events calendar server-side request forgery (ssrf) vulnerabilityThe Modern Events Calendar plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 7.12.1 via the 'me…EPSS 0.40%8.8CVE-2024-5441Webnus modern events calendar unrestricted file upload vulnerabilityThe Modern Events Calendar plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the set_featured_image…EPSS 1.1%8.8CVE-2021-24149Webnus modern events calendar lite sql injection vulnerabilityUnvalidated input in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.6, did not sanitise the mec[post_id] POST parameter in th…EPSS 1.5%7.5CVE-2021-24146Webnus modern events calendar lite improper access control vulnerabilityLack of authorisation checks in the Modern Events Calendar Lite WordPress plugin, versions before 5.16.5, did not properly restrict access to the exp…EPSS 31%7.2CVE-2021-24145Modern Events Calendar Lite plugin arbitrary file upload via CSV importThe Modern Events Calendar Lite WordPress plugin before 5.16.5 failed to properly validate files during import, so a PHP file could be uploaded by se…EPSS 87%analysed6.1CVE-2021-24925Webnus modern events calendar lite cross-site scripting vulnerabilityThe Modern Events Calendar Lite WordPress plugin before 6.1.5 does not sanitise and escape the current_month_divider parameter of its mec_list_load_m…EPSS 0.82%

Source: NIST National Vulnerability Database (record CVE-2021-24147), CISA KEV, FIRST EPSS (scores of 2026-10-18). This page is refreshed as NVD updates the record.